The Vibration-Sensitive S7 Section is located between A6 and A7 Station. Since the section is close to residential areas, and with crossover rail layout, the design of floating slab track is adopted to reduce vibration and noise. The slab track styles of this section consist of turnouts and diamond crossing combinations (including 4 sets of turnouts and 1 set of diamond crossing) and the general slab track sections connected to the head and tail of this slab track (4 slabs) is an integrated mass of concrete slabs. Concerning the installation regulations and the convenience of maintenance and replacement after official operation, the single rubber bearing and steel sleeve combination was adopted for the vibration control mechanism of this floating slab track.
The overall installation steps include slab track installation and slab track lifting. Regarding construction spatial design and slab track RFT distribution, the stationary slabs on the outer side of the slab track are firstly lifted. Next, distribution of insulation layer, switch sleeper, steel sleeve and slab track RFT on the bridge surface is performed. Then, turnout steel parts are put into place (eg. frog, stock rail, closure rail, guard rail) and are locked into the sleeper. Slab track material distribution is shown as fig 1. Last, after moldboard assembly and the calibration of the final rail alignment conducted, concrete pouring and curing process is in place.
When the concrete reaches certain intensity, the slab track lifting process follows. The order of lifting process starts from the outer general slab tracks to the diamond frog slabs, then to the 4 sets of slab tracks. In this orderly fashion, the center diamond frog, the extended 4 sets of single slab tracks and the floating slab track can then be smoothly connected. After lifting, the finished state of steel sleeve vibration control mechanism is shown as figure 2. Lastly, after installing the lateral and longitudinal rubber bearings between the slab track and stationary slabs, the slab track lifting and floating slab track installation is then completed.
- 圖2. S7區段浮動式道床軌道鋼質套筒減振機制定位完成狀態